Societe Atochem

Elf Atochem S.a.

Atofina

Jean-Jacques Martin

Pascal Michaud

Daniel Desbiendras

In order to replace compositions based on CFC or on HCFC in cleaning or drying applications on solid surfaces (in particular defluxing), the invention provides azeotropic or near-azeotropic compositions based on 1,1,1,3,3-pentafluorobutane, on dichloromethane, on methanol and on 1,1,1,2,3,4,4,5,5,5-decafluoropentane.

Cleaning or drying compositions based on F36mfc, CHzCLz, CH3OH and 43-10mee

Compns. based on azeotropic or quasi-azeotropic mixts. of trichloroethylene and 1,1,1,2,3,4,4,5,5,5-decafluoropentane are useful for replacing CFC or HCFC in cleaning and degreasing of surfaces (e.g., defluxing of printed circuits) and drying of surfaces. The ability of these compns. to dry surfaces is improved by addn. of RCONR(CH2)nNHCOR surfactants (R&equals;C14-22 alkyl, n&equals;1-5).

Cleaning or drying compositions based on 43-10mee and on trichloroethylene

In order to replace compositions based on CFC or on HCFC in cleaning or drying applications on solid surfaces (in particular defluxing), the invention provides azeotropic or near-azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, on dichloromethane, on cyclopentane and on methanol.

Cleaning or drying compositions based on 43-10mee, on CH2C12, on cyclopentane and on CH3OH

Cold cleaning composition based on alkanes or cycloalkanes and an

In order to replace compositions based on CFC or on HCFC in applications for cleaning or drying solid surfaces (in particular defluxing), the invention proposes azeotropic or virtually azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, methylene chloride and optionally methanol.

Cleaning or drying compositions based on

Cleaning agent based on cycloalkanes

To replace 1,1,2-trichloro-1,2,2-trifluoroethane (F113) in its applications to the cleaning and drying of solid surfaces, the invention propose to employ a (perfluoroalkyl)ethylene of formula:

Use of (perfluoroalkyl) ethylenes as cleaning or drying agents, and

For replacing cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising 55 to 80% by weight of 1,1-dichloro-1-fluoroethane (F141b) and 45 to 20% by weight of methyl formate. These two compounds form a positive azeotrope (b.p.=28.4.degree. C. at atmospheric pressure). The composition, which may be stabilized, can be used for cleaning solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical parts.

Cleaning composition based on 1,1-dichloro-1-fluoroethane and methyl

To replace 1,1,2-trichloro-1,2,2-trifluoroethane (F113) in its applications to the cleaning and drying of solid surfaces, the invention propose to employ a (perfluoroalkyl) ethylene of formula:

Use of (perfluoroalkyl)ethylenes as cleaning or drying agents, and

For replacing cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising 55 to 79.5% by weight of 1,1-dichloro-1-fluoroethane (F141b), 20 to 40% by weight of methyl formate and 0.5 to 5% of methanol. These three compounds form a positive azeotrope (b.p.=28.3.degree. C. at atmospheric pressure). The composition, which may be stabilized, can be used for cleaning solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical parts.

Cleaning composition based on 1,1-dichloro-1-fluoroethane, methyl

For replacing cleaning compositions based on 1,1,2-trichloro-1,2,2-trifluoroethane (F113), the invention provides a composition comprising 55 to 80% by weight of 1,1,1,2,2-pentalfuoro-3,3-dichloropropane (225ca) and 20 to 45% by weight of methyl tert-butyl ether. These two compounds form a negative azeotrope (b.p.=59.9.degree. C. at atmospheric pressure). The composition, which may be stabilized, can be used for cleaning solid surfaces, in particular for removing flux from printed circuits and for degreasing mechanical parts.

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Bois-Colombes, France

Jean-Jacques Martin